| (19) |
 |
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(11) |
EP 2 786 991 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
12.11.2014 Bulletin 2014/46 |
| (43) |
Date of publication A2: |
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08.10.2014 Bulletin 2014/41 |
| (22) |
Date of filing: 24.08.2009 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO
PL PT RO SE SI SK SM TR |
| (30) |
Priority: |
27.08.2008 US 92191 P
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
|
09789193.1 / 2344469 |
| (71) |
Applicant: Corning Incorporated |
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Corning, New York 14831 (US) |
|
| (72) |
Inventors: |
|
- Das, Suresh
695015 Kerala, Trivandrum (IN)
- Dufour, Bruno
77430 Champagne sur Seine (FR)
- Nair, Mangalam S.
695019 Trivandrum, Kerala (IN)
- Radhakrishnan, Kokkuvayil V
695019 Trivandrum, Kerala (IN)
|
| (74) |
Representative: Oldroyd, Richard Duncan |
|
Elkington and Fife LLP
Prospect House
8 Pembroke Road
Sevenoaks, Kent TN13 1XR
Sevenoaks, Kent TN13 1XR (GB) |
|
| |
|
| (54) |
Photochromic 2h-chromenes annelated at c5-c6 and their methods of preparation |
(57) Described herein are C
5-C
6 annelated naphthopyrans that possess at least one electron-withdrawing group. The
compounds possess desirable properties such as increased fading kinetics. Also described
herein are new methods for synthesizing 2H-chromenes annelated at C
5-C
6. The methods involve less stringent reaction conditions as well as provide increased
reaction yields. The methods permit the synthesis of a wide variety of substituted
naphthopyrans that can be temperature sensitive, which was not possible with previous
synthetic routes.